Device for receiving start-stop messages

 

The invention relates to electro - and radio and can be used in wired, radio, radio-relay and meteor scatter communication lines. The technical result - the reduction of the probability of false alarms. For this purpose the device is put in series with the first and second amplitude detectors one nonlinear element, the outputs are connected to respective inputs of subtractive device. 2 Il.

The invention relates to electro - and radio and can be used in wired, radio, radio-relay and meteor scatter communication lines.

A device for receiving start-stop messages containing connected in series receiver band-pass filter, peak detector, subtractive device, a breaker, a coherent filter, solver, the pulse shaper and the second solver, connected in series, a second band-pass filter, whose input is connected to the output of the receiver, and the second amplitude detector connected to the output of the second subtractive input device, the output of subtractive device connected to the second input of the second casting device, the third, fourth and fifth inputs of which are connected sootvetstvuushuu, moreover, the second output of the pulse shaper is connected to a second output of circuit breaker [1].

However, this device for receiving start-stop message has low immunity and high probability of false alarm.

Closest to the claimed device is a device for receiving start-stop messages [2]. Its functional scheme is shown in Fig.1.

It contains serially connected receiver 14, the first band-pass filter 15, the first amplitude detector 16, subtractive device 17, the switch 18, a coherent filter 19, a crucial device 20, the imaging unit 21 of the pulse generator 22 pseudorandom sequences (SRP) and the inverter 23, connected in series, a second band-pass filter 24, the inlet of which is connected to the output of the receiver 14, and the second amplitude detector 25, the output of which is connected to the second input of subtractive device 17, connected in series, the first delay line 26, the first key 27, the first demodulator 28 fathersname-modulated (MDF) signals and circuit 29, OR, and consistently connected to the second delay line 30, the second key 31 and the second demodulator 32 MDF signals, the output of which is connected to the second input of the circuit 29, OR, and inputs the first is the progress of a casting device 20 is connected to the second input of the generator 22 of the SRP, the output of which is connected to the control inputs of the first key 27 and the first demodulator 28 MDF signals, the output of the inverter 23 is connected to control inputs of the second key 31 and the second demodulator 32 MDF signals, clock inputs of the blocks 28 and 32 are connected to the output of the shaper 21 pulses, the second output of which is connected to a second input of circuit breaker 18.

However, this device for receiving start-stop message has a high probability of false alarms.

The invention is directed to reducing the likelihood of false alarms.

For this purpose, in the device for receiving start-stop messages containing the serially connected receiver 14, the first band-pass filter 15 and the first amplitude detector 16, connected in series subtractive device 17, the switch 18, a coherent filter 19, a crucial device 20, the imaging unit 21 of the pulse generator 22 of the SRP and the inverter 23, connected in series, a second band-pass filter 24, the inlet of which is connected to the output of the receiver 14, and the second amplitude detector 25, connected in series, the first delay line 26, the first key 27, the first demodulator 28 MDF signals and circuit 29, OR, and connected in series to the second delay line 30, the second key 31 and second damdiny delay are connected respectively to the outputs of the second 24 and the first 15 of bandpass filters, the output of a casting device 20 is connected to the second input of the generator 22 of the SRP, the output of which is connected to the control inputs of the first key 27 and the first demodulator 28 MDF signals, the output of the inverter 23 is connected to control inputs of the second key 31 and the second demodulator 32 MDF signals, clock inputs of the blocks 28 and 32 are connected to the output of the shaper 21 pulses, the second output of which is connected to a second input of circuit breaker 18, in series with the first 16 and 25 second amplitude detectors include a nonlinear element, the outputs are connected to respective inputs of subtractive device 17.

In Fig.2 presents a functional diagram of the proposed device for receiving the start-stop messages.

Device for receiving start-stop message contains serially connected receiver 1, the first band-pass filter 2, the first amplitude detector 3, the first nonlinear element 4, subtractive device 5, the circuit breaker 6, consistent filter 7, a crucial device 8, the imaging unit 9 pulse generator 10 of the SRP and the inverter 11, connected in series, a second band-pass filter 12, the inlet of which is connected to the output of the receiver 1, the second amplitude detector 13 and the second nonlinear element 14, delay 15, the first key 16, the first demodulator 17 MDF signals and circuit 18, and connected in series to the second delay line 19, the second key 20 and the second demodulator 21 MDF signals, the output of which is connected to the second input circuit 18, and inputs the first 15 and 19 second delay lines are connected respectively to the outputs of the second 12 and the first 2 bandpass filters, the output of the deciding device 8 is connected to the second input of the generator 10 of the SRP, the output of which is connected to the control inputs of the first key 16 and the first demodulator 17 MDF signals, the output of the inverter 11 is connected to control inputs of the second key 20 and the second demodulator 21 MDF signals, clock inputs of the blocks 17 and 21 are connected to the output of the pulse shaper 9, the second output of which is connected to the second input of the chopper 6.

The start-stop device message is as follows. After filtering in the receiver 1 signal is supplied to a frequency discriminator consisting of blocks 2-5, 12-14, and have the same non-linear elements 4 and 14, with the characteristic form y=xto(where x and y are the input and output signals, k= 2, 3, 4, ...), which generates at its output a bipolar signal, the elements of which in the absence of noise exactly match the characters "0" and is it the end of the SRP forms the high-level signal, and in the final device 8 in an optimal way is determined by the time position of its maximum, and at this time the output is formed by a short pulse. With regard to it in the shaper 9 pulses at the first output delay time T are n+2 short clock pulses and the pulse duration (n+2)T prohibiting through the circuit breaker 6, the signal on the next block. Blocks 15-21 designed for demodulation of the symbols of the message transmitted on two carrier frequencies. The first signal carrier frequency after a delay time equal to ST, the block 19 is provided by a key 20 which opens at a point in time corresponding to the zero elements of the SRP, to the input of the demodulator 21 MDF signal, which is demodulated signals with phase difference of the manipulation on this frequency. Similarly (in blocks 15-17) is the demodulation of the signal at the second carrier frequency. Obtained at the outputs of blocks 17 and 21 characters are combined into a single message in scheme 18. Thus, the device can reduce the probability of false alarm.

That this is indeed so, as you can see from the following.

You know, videokursov amplitude detector (see for example, S. 52-54 and Fig.3.11 in the book edited by Y. M. Kazarinov "Radio system", M. : Vysshaya SHKOLA, 1990). The synchronization signal in the closest device consists of radio pulses with different frequencies corresponding to the elements "1" and "0" Barker code, and video elements are combined in a subtractive device. Because the latter is the combination of the noise from the outputs of the amplitude detectors, the detection signal after accumulation does not give the optimal result. To implement the optimal detector would generate a separate accumulation of the signals at the outputs of the amplitude detectors, combine the results, and the result is compared with the threshold, and so on, However, such a detector would be very difficult. It turns out that this can be achieved in a much simpler way, after introducing the amplitude detector nonlinearity of high order.

All blocks included in the device for receiving start-stop messages are well-known devices. Various schemes phase difference demodulators shown, for example, in the book by A. M. Driveways and other "phase difference modulation", "Communication", 1967. For the purposes of demodulation MDF signals can be also used digital demodulator there, rash.B. and others About noise immunity start-stop communication system with frequency shift keying signal. - Theory and techniques of radio communications, 1998, vol.2.

2. RF patent 2177209, CL H 04 L 25/00.

Claims

Device for receiving start-stop messages containing the serially connected receiver, the first bandpass filter and the first amplitude detector, connected in series subtractive device, a breaker, a coherent filter, solver, shaper pulse generator SRP and inverter, connected in series, a second band-pass filter, whose input is connected to the output of the receiver, and the second amplitude detector, connected in series, the first delay line, the first key, the first demodulator MDF signals and the schema OR connected in series to the second delay line, the second key and the second demodulator MDF signals, the output of which is connected to the second input of the circuit OR moreover, the inputs of the first and second delay lines are connected respectively to the outputs of the second and the first bandpass filter, the output of a casting device connected to the second input of the generator of the SRP, the output of which is connected to the control inputs of the first key and the first demodulator MDF-cyclovia inputs of the first and second demodulators MDF signals connected to the output of the pulse shaper, the second output of which is connected to the second input of the circuit breaker, characterized in that in series with the first and second amplitude detectors include a nonlinear element, the outputs are connected to respective inputs of subtractive device.

 

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